<template>
    <div>
         <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
    <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
    <el-breadcrumb-item>商品管理</el-breadcrumb-item>
    <el-breadcrumb-item>参数列表</el-breadcrumb-item>
</el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
    
        <el-alert show-icon title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false">

        </el-alert>
        <!-- 选择商品分类区域 -->
        <el-row class="el-row-span">
            <el-col>
                <span>选择商品分类</span>
                 <el-cascader
      expand-trigger="hover"
    v-model="selectedCateKeys"
    :options="catelist"
    :props="cateProps"
    @change="getParamsData"
    clearable change-on-select></el-cascader>
            </el-col>
        </el-row>
        <!-- tab栏区域 -->
        <el-tabs v-model="activeName" @tab-click="handleClick">
            <!-- 添加参数的按钮 -->
            <el-tab-pane label="动态参数" name="many">
                <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">
                    添加参数
                </el-button>
                <!-- 动态参数表格 -->
                <el-table :data="manyTableData" border stripe>
                    <!-- 展开行 -->
                     <el-table-column type="expand">
                         <template slot-scope="scope">
                             <el-tag closable v-for="(item,i) in scope.row.attr_vals" :key="i" @close="handleClose(i,scope.row)">{{item}}</el-tag>
                        <!-- 输入的文本框 -->
                        <el-input
                class="input-new-tag"
                v-if="scope.row.inputVisible"
                v-model="scope.row.inputValue"
                ref="saveTagInput"
                size="small"
                @keyup.enter.native="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                                        
                         </template>
                     </el-table-column>
                    <!-- 索引列 -->
                    <el-table-column type="index"></el-table-column>
                    <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                            <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
            <!-- 添加静态属性的面板 -->
            <el-tab-pane label="静态属性" name="only">
                <el-button type="primary" size="mini" :disabled="isBtnDisabled"  @click="addDialogVisible=true">
                    添加属性
                </el-button>
                <!-- 静态参数面板 -->
                 <el-table :data="onlyTableData" border stripe>
                    <!-- 展开行 -->
                          <el-table-column type="expand">
                         <template slot-scope="scope">
                             <el-tag closable v-for="(item,i) in scope.row.attr_vals" :key="i" @close="handleClose(i,scope.row)">{{item}}</el-tag>
                        <!-- 输入的文本框 -->
                        <el-input
                class="input-new-tag"
                v-if="scope.row.inputVisible"
                v-model="scope.row.inputValue"
                ref="saveTagInput"
                size="small"
                @keyup.enter.native="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                                        
                         </template>
                     </el-table-column>
                    <!-- 索引列 -->
                    <el-table-column type="index"></el-table-column>
                    <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                            <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
         
        </el-tabs>
        <!-- 添加对话框 -->
      <el-dialog
  :title="'添加'+titleText"
  :visible.sync="addDialogVisible"
  width="50%"
  @close="addDialogClosed">
  <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" class="demo-ruleForm">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="addForm.attr_name"></el-input>
  </el-form-item>

  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
</el-dialog>
    </el-card>
    </div>
</template>
<script>
export default {
    data(){
        return{
            catelist:[],
            cateProps:{
                value:'cat_id',
                label:'cat_name',
                children:'children'
            },
            selectedCateKeys:[],
            //被激活的页签的名称
            activeName:'many',
            //动态参数的数据
            manyTableData:[],
            //静态参数的数据
            onlyTableData:[],
            //添加参数对话框
            addDialogVisible:false,
            //添加擦桉树的表单数据对象
            addForm:{
                attr_name:''
            },
            //添加表单的验证规则对象
            addFormRules:{
                attr_name:[
                    { required:true,message:'请输入参数名称',trigger:'blur'}
                ]
            },
            
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        //获取所有的商品分类列表
        async getCateList(){
            const {data:res } = await this.$http.get('categories')
            if(res.meta.status!==200){
                return this.$message.error('获取商品分类失败！')
            }
            this.catelist=res.data
            console.log(this.catelist);
        },
        //级联选择框选中项变化，会触发这个函数
        async handleChange(){
           
        },
        handleClick(){
            console.log(this.activeName);
            this.getParamsData()
        },
        async  getParamsData(){
             //证明选中的不是三级分类
            if(this.selectedCateKeys.length!==3){
                this.selectedCateKeys=[]
                this.manyTableData=[]
                this.onlyTableData=[]
                return
            }
            //证明选中的是三级分类
            console.log(this.selectedCateKeys);
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}})
            if(res.meta.status!==200){
                return this.$message.error('获取参数列表失败！')
            }
            res.data.forEach(item=>{
                item.attr_vals=item.attr_vals ?
                item.attr_vals.split(' '):[]
                //控制文本框的显示与隐藏
                item.inputVisible=false
                item.inputValue=''
            })
            console.log(res.data);
            if(this.activeName==='many'){
                this.manyTableData=res.data
            }else {
                this.onlyTableData=res.data
            }
        },
        addParams(){
            this.$refs.addFormRef.validate(async valid =>{
                if(!valid) return
                const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
                    attr_name:this.addForm.attr_name,
                    attr_sel:this.activeName
            
                })
                if(res.meta.status!==201){
                    return this.$message.error('添加参数失败！')
                }
                this.$message.success('添加参数成功')
                this.addDialogVisible=false
                this.getParamsData()
            })
        },
        //监听添加对话框的关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        //文本框失去焦点，或摁下了Enter都会触发
        async handleInputConfirm(row){
        
            if(row.inputValue.trim().length===0){
                row.inputValue=''
                row.inputVisible=false
                return
            }
            //如果没有return，则证明输入的内容，需要做后续处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue=''
            row.inputVisible=false
            //需要发起请求，保存这次操作
            const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
            {
                attr_name:row.attr_name,
                attr_sel:row.attr_sel,
                attr_vals:row.attr_vals.join(' ')
            }
            )
            if(res.meta.status!==200){
                return this.$message.error('修改参数项失败！')
            }
            this.$message.success('修改参数项成功')
        },
        //点击按钮，展示文本输入框
        showInput(row){
            row.inputVisible=true
             this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
        },
        async handleClose(i,row){
            row.attr_vals.splice(i,1)
              //需要发起请求，保存这次操作
            const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
            {
                attr_name:row.attr_name,
                attr_sel:row.attr_sel,
                attr_vals:row.attr_vals.join(' ')
            }
            )
            if(res.meta.status!==200){
                return this.$message.error('修改参数项失败！')
            }
            this.$message.success('修改参数项成功')
        }
    },
    computed:{
        //如果按钮需要被禁用，则返回true，否则返回false
        isBtnDisabled(){
            if(this.selectedCateKeys.length !==3){
                return true
            }
            return false
        },
        cateId(){
            if(this.selectedCateKeys.length===3){
                return this.selectedCateKeys[2]
            }
            return null
        },
        titleText(){
            if(this.activeName==='many'){
                return '动态参数'
            }
            return '静态属性'
        }
    }
}
</script>
<style lang="less" scoped>
.el-row-span {
    margin: 15px 0;
}
.el-cascader {
    margin-left: 15px;
}
.el-tag {
    margin: 10px;
}
.input-new-tag {
    width: 120px;
}
</style>